Regulator for dynamos



(No Model.)

W. H. ELKINS.

REGULATOR FOR DYNAMOS.

No. 430,634. Patented June 24, 1890.

UNITED STATES PATENT OFFICE.

\VILLIAM HENRY ELKINS, OF BOSTON, MASSACHUSETTS.

REGULATOR FOR DYNAMOS.

SPECIFICATION forming part of Letters Patent No. 430,634, dated June 24, 1890.

Application filed June 10, 1889. Serial No. 313,800. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM HENRY EL- KINS, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Regulator for Dynamos and the Like, of which the following is a specification, reference being had to the accompanying drawings, making a part hereof, in which Figure 1 is a diagram illustrating my regulator at full load; Fig. 2, at half load, and Fig. 3 at minimum load. Figs. 4, 5, and 6 are sectional views on the lines 4 4, 5 5, and 6 6, and illustrate the construction of one of the rheostats.

My invention relates to connecting two armaturesfor example, a single-ball dynamo which has two armatures or two single armature dynan10s-s0 that the current can be regulated without undue haste, in accordance with the load; and it consists in the combination of two or more armatures by means of conductors and resistances, substantially as below described.

In the drawings, A A represent two armatures, B B the brushes of armature A, and B B the brushes of armature A. The brushes B B which are of like sign, are connected by the conductors b, b, and b and there is a variable resistance R, forming part of the conductors b Z), and a second variable resistance R, which forms part of the conductors b 11 but whose main function is to connect or disconnect armature A and workcircuit F F L L. The brushes B and B- that is, the positive brush of A and the negative brush of Aare connected by the conductors b b and variable resistance R forming a part of them. The two negative brushes B B are connected through the work-circuit F F L L and by conductor b through variable resistance R. The brushes B B are also connected by conductors b b through resist ance R When under full load, the resistance R is adjusted, as shown in Fig. 1, thereby causing conductors b b to form a single conductor of low resistance between the positive brush of A and the negative brush of A, and the resistance R is adjusted to cause a high resistance in the conductors b b, of which R forms a part, while the resistance R is adj usted to form a low resistance between the conductors b and the work-circuit F F L L,

as shown in Fig. 1. In this condition of the rheostats R R R the armatures are in series, the current being from brush B through conductors b R b to brush B, and from brush B of armature A through conductor 5 R F F L L to brush B the electro-motive force being then the maximum, It now, say, halt the lights be put out, and assuming the lights or other load to be in series, the resistance R is adjusted so as to give a high resistance to the conductors 19 Z), of which R forms a part, and the resistance R is also adjusted to give a high resistance between all the conductors of which it forms a part, while the resistance R is adjusted to make the resistance of con ductors b 1) small; hence armature A is practically an open circuit, for the resistances R and R are so great when adjusted, as in Fig. 2, that no appreciable current can pass through conductors b 12 which join its brushes B B through resistance R, nor can any appreciable current pass through conductors 12 19 which also join brushes B B through resistance R hence the work-circuit F F L L is fed by armature A, the current being from brush B through conductors b l) and work-circuit F F L L to brush B When all the lamps are out or under minimum load, the resistances R R are regulated so as to make the resistance slight between conductor b and the work-circuit F F L L, and also to make the resistance slight between conductors b and b and the resistance R is adjusted to make a high resistance between the conductors b 1); hence the current generated by armature A tends to flow through conductors b b and in a reverse direction through brush B armature A, brush B work-circuit L L F-F, conductor 12 to brush B of armature A, and the current generated by armature A cannot flow through conductors b and I) because of the high resistance of R, and cannot flow through conductors b I) because of the high resistance of R nor through conductors b 1) b because of the high resistance of R-that is to say, each armature is neutralized by the other, as will be clear from Fig. 3, when the resistances R R R are adjusted as indicated in that figure.

- While I have shown the resistances R R R at both extremes and at their mesne, it

will yet be obvious that their adjustment will be intermediate between that shown in Fig. l and that shown in Fig. 2 when the load is between full load and half load, and between that shown in Fig. 2 and that shown in Fig. 3 when the load is between half load and minimum load. I have not shown any means for adj Listing the rheostats R R R as those skilled in the art will fully understand all that relates to this resistance without further description. The details of construction of rheostats R R R will be plain, also, from the drawings without further description, and they may of course be of any suitable construction. As shown in the diagrams, they indicate two electrodes in a vessel of water in R, and then electrodes in a vessel of water in R and R While I have described my regulator as applied to keeping the current constant, it will be clear that it is equally applicable to keeping the pressure or difference of potential constant.

\Vhat I claim is In combination, two armatures, their brushes, the main circuit, conductors, of which a rheostat forms a part, connecting the unlike brushes of the two armatures, conductors, of which a rheostat forms a part, connecting the like brushes of the armatures, conductors, of which a rheostat forms a part, connecting one brush of one of the armatures with the main circuit, and conductors, of which a rheostat forms a part, connecting each brush of the other armature with the main circuit, the arinatures, their brushes, the main circuit, the conductors, and the rheostats being arranged and operating substantially as described.

VILLIAM HENRY ELKINS. lVitnesses:

W M. H. Hares, Woon Molina. 

